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Posted: 10/10/2018 10:14:13 PM EDT
[#1]
Have you troubleshooted with superlative arms? Opening the gas port is the only thing I could think of as well, as it is the only thing that would make sense in this situation.
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Posted: 10/10/2018 10:16:25 PM EDT
[#2]
Quote HistoryQuoted:
Have you troubleshooted with superlative arms? Opening the gas port is the only thing I could think of as well, as it is the only thing that would make sense in this situation. I have spoke to them before. Very nice, but can be hard to reach. |
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Posted: 10/10/2018 10:19:22 PM EDT
[#3]
if they get back to you please update us. What handguard did you put this on? is the op-rod clearing the barrel nut without touching it? The friction could be interfering
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Posted: 10/10/2018 10:22:13 PM EDT
[#4]
Quote HistoryQuoted:
if they get back to you please update us. What handguard did you put this on? is the op-rod clearing the barrel nut without touching it? The friction could be interfering https://aeroprecisionusa.com/ar15-enhanced-mlok-handguards.html |
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Posted: 10/10/2018 10:23:37 PM EDT
[#5]
Quote HistoryQuoted: Aero Gen 2 Enhanced M-lok. The op rod literally slides in and out. Adjusted the nut to exactly 37 ft-lbs with shims to precisely center it. https://aeroprecisionusa.com/ar15-enhanced-mlok-handguards.html |
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Posted: 10/10/2018 10:26:46 PM EDT
[#6]
Quote HistoryQuoted: the only thing that makes sense would be not enough gas entering the system |
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Posted: 10/10/2018 10:28:38 PM EDT
[#7]
sorry I can't be more help. Keep up posted
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Posted: 10/11/2018 12:04:11 PM EDT
[#8]
You said it wasn't locking open. Would it cycle at all? Check to be sure your bolt catch is working. At full gas, the recoil should be fairly stiff. Is it? Check to make sure you're adjusting in the right direction.
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Posted: 10/11/2018 7:31:17 PM EDT
[#9]
Called Criterion barrels today. Still have not reached Superlative.
Suggested the possibility the system is OVER gassed and running too fast. It is possible. Will need to lower the setting, test at range and post updates. |
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Posted: 10/11/2018 7:51:12 PM EDT
[#10]
I didn't know they made a piston kit. Interesting. Please update when you can.
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Posted: 10/11/2018 7:56:42 PM EDT
[#11]
Quote HistoryQuoted:
I didn't know they made a piston kit. Interesting. Please update when you can. Will test and report shortly. |
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Posted: 10/13/2018 4:33:51 PM EDT
[#12]
UPDATE:
Installed white "standard" power Sprinco spring and standard (not H or H2) buffer. 18" barrel w/ rifle length gas system. With gas port opened 3.5 out of 4.5 max turns was able to lock back on empty chamber, reload rounds and eject to 4 o'clock. Seems rifle length presents some issues. Will put a few hundred down range shortly and report back. |
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Posted: 10/13/2018 5:02:39 PM EDT
[#13]
Barrel’s gas port needs opened up for the piston kit.....only way you will get the piston kit to run.
Rifle length gas systems can be touchy even when running DI. What ammo have you been running? |
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Posted: 10/13/2018 6:17:32 PM EDT
[#14]
Quote HistoryQuoted:
Barrel’s gas port needs opened up for the piston kit.....only way you will get the piston kit to run. Rifle length gas systems can be touchy even when running DI. What ammo have you been running? I have calls into Superlative. The owner's nephew said they'd get back to me, but opening up the port is let resort they disfavor. If it works well with standard buffer/spring and with a variety of ammunition I may just let it go. |
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Posted: 10/13/2018 8:05:12 PM EDT
[#15]
Have in the adjustable gas set to nearly all the way open with mediocre ammo tells me it’s undergassed
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Posted: 10/13/2018 8:15:25 PM EDT
[#16]
Quote HistoryQuoted:
Have in the adjustable gas set to nearly all the way open with mediocre ammo tells me it’s undergassed With 4 o'clock ejection and cycling, albeit with standard buffer & standard spring, do I just leave it alone? Hope to hear back from Superlative and will also call the extremely helpful Criterion again as well. |
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Posted: 10/13/2018 8:24:23 PM EDT
[#17]
Yes, you need more manufacture support
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Posted: 10/17/2018 10:37:12 AM EDT
[#18]
UPDATE:
I speak to Tony, the owner of Superlative, who says that with a RIFLE length gas system it is normal to need a standard spring and buffer and the gas open full 4.5 turns. This I did NOT see coming as every other piston and DI carbine I have starts with an H2 buffer and more powerful spring. They all like blue "Sprinco" brand. So......it would seem the piston kits and rifle length gas systems are a bit more finicky. Should have gone with a mid-length. Thanks to all. |
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Posted: 10/19/2018 6:17:56 AM EDT
[#19]
The barrel you chose is your problem, not the piston kit.
Not all barrels are compatible with adjustable gas valves. Simply put, this barrel is gassed properly. The piston system you chose needs a larger port to run nominally at its mind range setting. Some 18” barrels with rifle length gas systems are very troublesome. It’s about the port size and the dwell time. Personally, I would not want an adjustable gas system that I had to run full open to get to run. If you were shooting this setup suppressed, you would end up in a mite mid-range setting. |
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Posted: 10/19/2018 6:22:34 AM EDT
[#20]
Did you try getting rid of the gap between the gas block and shoulder?
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Posted: 10/19/2018 10:26:51 AM EDT
[#21]
Quote HistoryQuoted:
The barrel you chose is your problem, not the piston kit. Not all barrels are compatible with adjustable gas valves. Simply put, this barrel is gassed properly. The piston system you chose needs a larger port to run nominally at its mind range setting. Some 18” barrels with rifle length gas systems are very troublesome. It’s about the port size and the dwell time. Personally, I would not want an adjustable gas system that I had to run full open to get to run. If you were shooting this setup suppressed, you would end up in a mite mid-range setting. Did not realize an 18" barrel would be problematic. Next time its a 16 or 20. |
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Posted: 10/19/2018 10:27:36 AM EDT
[#22]
Quote HistoryQuoted:
Did you try getting rid of the gap between the gas block and shoulder? |
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